WordPress 6.4.3 – Maintenance and Security release

This security and maintenance release features 5 bug fixes on Core, 16 bug fixes for the Block Editor, and 2 security fixes.

Because this is a security release, it is recommended that you update your sites immediately. Backports are also available for other major WordPress releases, 4.1 and later.

You can download WordPress 6.4.3 from WordPress.org, or visit your WordPress Dashboard, click “Updates”, and then click “Update Now”. If you have sites that support automatic background updates, the update process will begin automatically.

WordPress 6.4.3 is a short-cycle release. The next major release will be version 6.5 planned for 26 March 2024. You can review a summary of the maintenance updates in this release by reading the Release Candidate announcement. For further information on this release, please visit the HelpHub site.

Security updates included in this release

The security team would like to thank the following people for responsibly reporting vulnerabilities, and allowing them to be fixed in this release:

  • m4tuto for finding a PHP File Upload bypass via Plugin Installer (requiring admin privileges).
  • @_s_n_t of @pentestltd working with Trend Micro Zero Day Initiative for finding an RCE POP Chains vulnerability.

Thank you to these WordPress contributors

This release was led by Sarah Norris, Joe McGill, and Aaron Jorbin.

WordPress 6.4.3 would not have been possible without the contributions of the following people. Their asynchronous coordination to deliver maintenance and security fixes into a stable release is a testament to the power and capability of the WordPress community.

Aki Hamano, Alex Concha, Alex Lende, Alex Stine, Andrea Fercia, Andrei Draganescu, Andrew Ozz, Andrew Serong, Andy Fragen, Ari Stathopoulos, Artemio Morales, ben, bobbingwide, Carlos Bravo, Carolina Nymark, Česlav Przywara, Colin Stewart, Daniel Käfer, Daniel Richards, Dominik Schilling, Ella, Erik, George Mamadashvili, Greg Ziółkowski, Isabel Brison, Joen A., John Blackbourn, Jonathan Desrosiers, joppuyo, Lax Mariappan, luisherranz, Markus, Michal Czaplinski, Mukesh Panchal, Nik Tsekouras, Niluthpal Purkayastha, Noah Allen, Pascal Birchler, Peter Wilson, ramonopoly, Riad Benguella, Sergey Biryukov, Stephen Bernhardt, Teddy Patriarca, Tonya Mork

How to contribute

To get involved in WordPress core development, head over to Trac, pick a ticket, and join the conversation in the #core and #6-5-release-leads channels. Need help? Check out the Core Contributor Handbook.

As a final reminder, The WordPress Security Team will never email you requesting that you install a plugin or theme on your site, and will never ask for an administrator username and password. Please stay vigilant against phishing attacks.

Thanks to Angela Jin, Ehtisham S., Jb Audras, and Marius L. J. for proofreading.